Heat transfer enhancement of fin-tube heat exchangers with vortex generators is investigated using naphthalene sublimation technique. Experiments are performed for the fin-flat tube and the fin-circular tube heat exchangers with and without vortex generator. Vortex generators are found to enhance heat transfer rate on the fin surface dramatically. Their effect is relatively high in the fin-flat tube heat exchanger compared to fin-circular tube heat exchanger. Performance test is done for the prototype of air-conditioning heat exchanger and gas boiler heat exchanger with and without vortex generators .Fin-flat tube heat exchanger with vortex generator promote local heat transfer coefficient by 75% and increase friction factor, but friction of fin-flat tube heat exchanger with vortex generator is lower than that of fin-circular tube heat exchanger without vortex generator by 45%

Abstract
 1. 서 론
 2. 핀-관 열교환기의 국소열전달 특성
  2.1 실험장치 및 실험방법
  2.2 열전달계수 계산
  2.3 국소열전달 실험 결과 및 고찰
 3. 핀-관 열교환기 시작품의 성능평가
  3.1 핀-관 열교환기 시작품
  3.2 성능시험장치 및 시험방법
  3.3 성능시험 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 이상윤(써맥스 기술개발부) | S. Y. LEE
• 민상기(우송정보대학 기계자동차설비계열) | S. K. MIN